Questions tagged [high-current]
Say how much current is required, high-current means different things to different people.
1
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2answers
157 views
IGBT destroyed. Help me identify any potential problems
I am trying to build an inductive oven control (for temperatures up to 1500 C), that controls the temperature by turning on the the inductive oven on and off like a commercial inductive hotplate.
...
1
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0answers
248 views
Pulsed DC, kA range inductive transient protection method
I would like to design a transient protection solution for HVDC_pulse_unit.
HVDC voltage = 3500V , current > 40kA.
Events:
D1 flyback diode survives(50kA surge forward current).
MOVs section did ...
0
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0answers
33 views
IGBT died probably due to Inductive Load, What to do?
one of my IGBT died during its first test yesterday. I want to be able to switch an Inductive Oven (same like many modern hotplates) on and off in a specified Interval (every 3 or 4 seconds for ...
0
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2answers
70 views
Can power transformers be used with higher voltages?
I purchased a Japanese transformer for a project I’m doing. It runs on 100VAC, not 120V, something I overlooked. Doing a quick search, Japan seems to use both 50/60Hz, based on the region.
It’s 30 ...
2
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2answers
53 views
Will a 300A HV connector fail before a 600A fuse does?
I know this is a silly question but I cannot find ant data indicated it will not. The HV connector rated at 300A @ 85C and it is a 600A fuse, I cannot find a connector with a higher current rating.
...
0
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1answer
36 views
MOSFET-switching between two power supplys: how to avoid transverse current?
For a hobby project I would like to switch between two power supplys.
The two power supplys are two 6s LiPo batteries. If one battery is empty i want to immediatelly switch to the other battery. (the ...
1
vote
2answers
95 views
Electrical Heater Confusion
I know that a semiconductor material, that is usually used for heaters in variety of application, heat up due to high current, which flows through them or high power dissipation across them.
But lets ...
0
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1answer
79 views
Looking for resources for determining cable requirements for high wattage (MW) applications
I'm doing some personal research on the specifications for cables that can handle megawatt power draws. As an example, the wires needed to supply 450VAC @ 2000A (0.9MW). I'm looking for wire diameters ...
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2answers
139 views
How to limit HV capacitor charging current?
I have a voltage doubler, which is connected to mains (without galvanic isolation):
It enticed me with its simplicity, configurability and option between charging speed or desulfatability.
The ...
0
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0answers
44 views
Pulsed a magnetic field, what would be a suitable way to pulse a high current?
I would like to pulse a magnetic flux of up to 25 mT, for an experiment. I would like the pulses to be as short as possible 60-70 ns.
I have a solenoid, 10 cm in length, 5 cm diameter with 7 turns, ...
0
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0answers
33 views
Transistor for high power application in photovoltaics
I have the following situation, where there is a need for a switch with low conduction losses and controllable variable resistance, to cut-off photovoltaic (PV) panel.
The PV panel is in series with ...
6
votes
1answer
98 views
Switch high voltage with triggered spark gap
I want to switch a high current/voltage pulse (up to few 10kV, <1kA) from a capacitor as supply. It needs to be cheap and I don't care about efficiency too much yet.
I took a look at using ...
1
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0answers
97 views
Soldering sheet busbars to PCB concerns
Hello fellow engineers
I have decided to solder busbars to a high current pcb , but i have 2 concerns :
Does soldering a flat busbar (shown in left image) could cause thermal stress and deformation ...
0
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2answers
60 views
High current/high voltage/high frequency measurement
I have a circuit that I'm having trouble understanding. It measures the current flowing through a conductor. The measured load is 20-100 Amps, 9kHz-34kHz, and approx. 340 volts. The main conductor ...
1
vote
3answers
75 views
Why Does Flyback Current Destroy Darlington Buffered Op-Amp?
I am working on a project where I'd like to deliver variable DC control voltages to a continuous solenoid motor in order to achieve different velocities of actuation.
To buffer my DC control voltage ...
2
votes
2answers
147 views
16A Relay controlled with PWM
I am not very experienced with relays but I need to control the state of a relay with a PWM signal such that if the microcontroller is damaged and the controlling pin gets stuck in a high or low state ...
2
votes
0answers
169 views
TDA7294 100W Audio Amplifier Causing Unexpected Problems
This is the circuit I will be referring in this question:
TDA7294 is described in this data sheet. Upper IC with added external components is a well-known circuit and can be found on many websites ...
1
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0answers
75 views
Turn ON/OFF 5V 2-5A by Raspberry Pi GPIO
I need to control few 5V 2-5A devices by rpi GPIOs, which has the 3.3V logic level. I come up with a simple circuit, but I'll appreciate any ideas, corrections, suggestions. The LOAD is something like ...
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4answers
77 views
Can I provide a constant charge to a battery?
I have a sketch here of what seems like a solid plan. sketch
I need to provide a .2ohm coil around 3.7v which will take around 20 amps. The load will be very brief; 3-5 seconds, and intermittent; ...
0
votes
5answers
293 views
Best way to solder to a relay pin requiring ~30A of current?
On our hot tub circuit board, a trace on the PCB finally got cooked... Quite little damage, actually. The one trace is blackened, and the PCB now has a hole in it, but otherwise, everything looks ...
0
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1answer
56 views
Digital switch for 2000V capacitor [closed]
I want to produce a discharge of a capacitor against a test cell, as part of a study on high energy states of materials.
I'm using a standard microwave oven transformer as the power supply that I ...
0
votes
3answers
78 views
Protect power supply from regenerative drive
I am running a 3KW motor on a big 24Vdc power supply (Meanwell RST-5000), through a frequency drive.
When stopping the motor, however, I occasionally get a regenerative backcurrent that trips the ...
0
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2answers
114 views
Transimpedance Amplifier (TIA) - How to shunt high current spikes?
I am working on the design of a high-bandwidth transimpedance amplifier (TIA) to detect a relatively weak optical signal (100μW) but also be able to withstand short pulse, high power optical signals (>...
0
votes
1answer
71 views
Mosfet blows on high load using gate driver
I am using LM5060 from TI for switching big modular N channel MOSFET in SOT-227 package (IXFN420N10T) for relative high 100-200A loads.
On small loads like 10-20A it was working fine then we tried a ...
0
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2answers
62 views
Seeking recommendation for capacitor to handle high pulse current
I'm seeking recommendations for an inexpensive capacitor that will handle fairly-large pulse currents. Maximum voltage is 15 Vdc applied to the capacitor and I'd like to see current pulses in the ...
0
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3answers
317 views
Can I get a 150V DC output LM317HV-MIL
Can I get a 150V DC output from the circuit below by using LM317HV-MIL? As the voltage input I will be using a 160V unregulated input voltage from a rectifier.
If so, is there anything that I have ...
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votes
2answers
93 views
16Amp plug to 6Amp plug [closed]
I have 6Amp socket all around my home, but my washing machine has 16Amp plug.
Can convertor be used to plug 16 Amp in 6 amp socket somehow?
I am in India, so electricity is 240v50Hz
0
votes
2answers
126 views
High current in Coil/Inductor
I'm trying to build a 5V 8A buck converter and I chose the XL4016E1 IC for this operation (datasheet). There it says I need a 47uH 12A coil. Unfortunately i couldn't find a coild with such a high ...
2
votes
4answers
812 views
what is the temperature equilibrium for a copper conductor conducting 4000 Amps
I have a copper conductor with a total resistance of 1 miliohm and a passing current of 4000 Amps.
I want to know what the temperature equilibrium is for a conductor in the electrical grid (conductor ...
2
votes
1answer
116 views
High current plasma jet striking circuit
A little background: I'm a mechanical engineering graduate student with a focus in materials, so electrical engineering is not my core background. I'm conducting research on plasma surface treatment ...
0
votes
1answer
257 views
How can you calculate a railgun's exit velocity?
Having a cylindrical iron container with wall thickness of 20 cm, and a total weight of 50 tons when filled with its cargo, how would you be able to calculate its required voltage and current input in ...
0
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1answer
94 views
High Voltage Nodes creep-age and clearance standards for electronics?
I am trying to design with the NCV5183 with a 400V DC bus. I am trying to figure out the creepage/clearance standards i need to consider for high voltage layout and if the IC's pin to pin spacing is ...
0
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1answer
60 views
Power Supply for two 50V/12.5A Solenoids
I'm in the planning stages of building a custom pinball table and one of the sticking points is powering the flipper coils. They're 50V DC coils with a resistance of only 4 ohms during the stroke. ...
0
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0answers
68 views
20A current measurement with hall effect sensor
I am not aware of drawing more than 1A over PCB traces. We are planning to use ACS712 hall effect current sensor linked below:
https://www.amazon.in/KitsGuru-KG134-ACs712-Current-Arduino/dp/...
0
votes
2answers
224 views
OpAmp with high output current and capacitive load
I am trying to solve the following problem which - until today - I thought to be a trivial one: I have multiple reference voltages (from different sources) that I need to buffer and/or invert, filter ...
1
vote
0answers
118 views
Voltage Sucked Down on OPA541 (amplifier) Circuit Output
I am currently working on a design to generate a 5VAC (rms) @ 400Hz supply capable of 5A continuous. The design contains a non-inverting amplifier that takes a 213mV (rms) @ 400Hz voltage waveform (...
28
votes
6answers
5k views
How can the contact points of jumper cables handle the hundreds of amps required to start a car?
When jumpstarting a car, you connect those big alligator clamps to the terminals of the batteries. The cables themselves can handle the current just fine, but the contact points between the alligator ...
1
vote
3answers
431 views
What's inside power bank car jumper
All powerbanks that have car-jump function have some thingy between the clamps and powerbank socket:
What's inside that thingy?
The manufacturers typically claim 300A of starting current for ...
1
vote
1answer
442 views
How do I design a PCB for high current applications?
I'm attempting to design a PCB that will have 8 high-side drivers. I'm struggling with designing the PCB, because it seems the pad on the back of chip isn't large enough to carry the max current it is ...
0
votes
2answers
56 views
12v 4.8Ah DC regulated to BOTH 5v with 1.9A and 5v 5A
I am in the process of designing a circuit. I am unsure how to design a regulator to power the system.
I don't know of a way to be able to achieve what is shown in the diagram above. Looking online ...
2
votes
1answer
217 views
Why do I get high DC current in grid tied inverter output?
Edit: Added gating signal waveforms. Changed some of the graphs, I accidentally put a test circuit waveforms the first time. Current is not that high but offset is there and current is high for a ...
0
votes
1answer
136 views
PCB Current Draw vs Temperature Rise Interpretation and Question
I am using this tool for current calculation
While changing the input parameters i realized Temperature Rise °C is affecting the current draw.(you might say OF COURSE!)
At Ambient Temperature = 25°C ...
3
votes
2answers
853 views
Op-amps, why do they have such low output currents
An introduction to my question is that ultimately op-amps drive something with their output stage (i.e., they source or sink current). I am looking specifically at the current sourcing scenario for ...
1
vote
2answers
242 views
Power requirements, and feasibility for a short high power bursts (very fast heating application)
I would like some help to evaluate the electrical feasibility of a system to heat 35 gram of thermoplastic material (for active stiffness control) in 50 ms, by about 100 degrees Celsius.
The material ...
0
votes
1answer
33 views
Current Boosting Techniques for Source Side
I'm trying to use a portable power bank (5V/2.1A) and try to supply power to my DC/DC Converter which will then be used to power something else (probably a laptop or so). However, the issue is that ...
0
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2answers
150 views
Why is this high amperage metal melter making an electric arc?
There is a video on youtube with a device for melting metal (video below). It's a step-down transformer that transforms 120VAC in primary coil to ~3VAC in secondary coil, therefore stepping up the ...
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2answers
202 views
Safety of current with duration [duplicate]
My question is about how dangerous a momentary amount of current is vs the duration. Like is there a reasonably consistent relationship between current duration through the body and relative danger? ...
4
votes
2answers
450 views
Is it safe to use narrow but short PCB traces for high current flow?
I am trying to design a PCB which has high current traces on it.
PCB has 1 oz (35 um) trace thickness. Maximum current flow is going to be 12 Amps RMS.
I found this online PCB thickness calculator: ...
-3
votes
1answer
79 views
How much current would give a little shock [closed]
I just read on a website that 5mA is enough to give a little shock but I have touched 650mA and nothing happened.
Does that mean that 650mA becomes too small when I touch it due to resistance of my ...
10
votes
5answers
3k views
High Voltage PWM Motor Controller - Mosfets Explode
I've searched every post for an answer to this problem. I've built a motor controller circuit as shown in this diagram.
I made the diagram as accurate as possible. The diodes on the mosfets were ...
